I’m betting on the bookies. When you total the odds, you see that 30% of the bets goes to the bookies.
All things being equal, if you add up the odds, with 8 teams in the running, it should average out to 7-1. Here it actually adds up to 7.125 to 1.
4, 4, 4, 5, 6, 8, 8, 18 = 57
57/8 = 7.125